B18? B16? Gsr? K Series? Help Me Decide!!!!

I RECENTLT BOUGHT A 90 CRX SI. IT CAME WITH A STOCK '92 ITEGRA LS. I AM LOOKING FOR ADVISE ON WHAT TO DO WITH MY NEW BABY. AT FIRST I WAS LOOKING INTO MAKING HER AWD, BUT I HAVE ALREADY BEEN TOLD BY TOO MANY PEOPLE THAT IT WOULD COST WAY TO MUCH MONEY. SO NOW I AM STUCK WITH THE DELEMA OF WHAT TO DO NOW. THIS IS MY FIRST HONDA, BUT I AM WELL AWARE OF THE POSSIBILITIES THAT COME WITH THEM. BUT FIRST, SHOULD I GO K SERIES, DOWN GRADE TO A B16, UPGRADE TO A B18C1 (GSR I THINK), OR STICK WITH MY B18 AND PUT MY MONEY INTO THAT? BASICLY, I WANT THE MOST "BANG FOR MY BUCK," FOR LACK OF BETTER WORDS. I REALLY DON'T WANT TO SPEND MORE THAT 10-15K, I KNOW THAT SOUND LIKE A LOT, BUT THAT IS INCLUDEING BODY WORK AND PAINT. PLEASE HELP ME!!!!!!!!!!!

PS......I WOULD ALSO LIKE TO KNOW TRANNY OPTIONS AND TURBO PREFFERENCE, OR IF IT WOULD BE BETTER TO STAY NA. THANKS.

if it came with a b18b i say use that....i know you say i want to throw 15k at it but you already have a awsome building block....K serise is out of my leauge, and i cant give you any info on them cause i dont bother learning....

pull you ls motor.....fully build the botom end, do some valve work....turbo....t3/t4...60trim....60ar.on both sides...a good ramhorn manifold..and boost 20psi...youll be at 350 to 400 hp in a light ass crx....and youll have spent less then 4k.. and that would be bad ass....

but if money is not an issue..then learn about the almight K and build that for boost...